EQUIPMENT SELECTION AND REVIEW
Day 2 Session 4
Objectives
• Examining the lifecycle process• RAM modeling to evaluate designs• Conducting the Maintainability Design Review• Developing a MDR checklist
Lifecycle Process
Concept
Design
MFGUse
End of life
Concept & Design
Concept
• System Architecture• Reliable v Available• Goal setting
Design
• Selection of materials• Selection of
components• Risk identification• Tradeoffs
Production & Use
Production (manufacture)
• Process variation• Materials variation• Shipping variation• Installation variation
Reliability only gets worse
Use
• Operation Stress• Environment Stress
• Maintenance Plan• Failure Detection
End of life
Decommissioning
• Lessons learned• Tear down and analysis• Reliability Differences
with today’s model
Discussion & Questions
Reliability Modeling
• Focus on function– Common– Perfect product
• Focus on reliability– Uncommon– Imperfect product
• CAD, FEA, Simulations
Design Comparison
• Reliability occurs in the design
• Selecting the most robust options
• DOE, Stress/Strength, Aging, Maintenance Costs, Failure Costs
What if analysis
• What could go wrong?
• Explore changes to – Environment– Construction– Use profile– Materials
Good designer do this naturally
System Modeling
• Simulate different– Maintenance policies– Maintenance practices– Supply chain changes
• DOE to design the experiments
• Output is cost of ownership and availability
Discussion & Questions
Design Reviews
• Adversarial or Constructive
• Formal or informal
• Status update or detailed design check
How do you approach reviews?
Stages of Review
• During design– Risk assessment– Options and benefits– Decisions
• During review– Increase awareness– Identify errors (Petroski)– Celebrate failures
• After review– Process improvement– Lessons learned
Hosting a review
• What is the purpose?
• What decisions are being made?
• What is desired outcome?
Be clear on why
Considerations
• People– Knowledgeable– Stakeholder– Perspective
• Timeline– Time for details– Time for action
• Meetings– One on one– Group
Discussion & Questions
Review checklists
• Avoid using a checklist or database– Detailed checks, i.e.
keepouts, sizing, etc.– Goal is do the checklist
• Do use the approach guided by checklist– Higher level– Range of stresses
Review guidelines
• Brainstorming approaches– Day in the life– Range of stresses– Change one thing
• Make it safe to talk about failure– Not personal– No attacks– No solutions (take offline)
Checklist cautions
• Design checklists
• Testing checklists
• Review checklists
Only works if you know everything and follow the spirit of the checklist
Golden Nuggets
• An example that has been very effective
• Identify key failure patterns
• Review before and after project– What will you do?– What did you do?
Discussion & Questions
Summary
• Examining the lifecycle process
• RAM modeling to evaluate designs
• Conducting the Maintainability Design Review
• Developing a MDR checklist
Equipment Selection & Review
